Product Code: ICAL08_1606

Laser Cladding Ni-base Composite Coatings Reinforced by In-Situ Synthesized Multiple Carbide Particles
Mingxing Ma, ; Beijing Peoples Republic of China
Ruiquan Kang, ; Beijing Peoples Republic of China
Minlin Zhong, ; Beijing Peoples Republic of China
Wenjin Liu, ; Beijing Peoples Republic of China
Weiming Zhang, ; Beijing Peoples Republic of China
Yide Kan, ; Beijing Peoples Republic of China
Hongjun Zhang, ; Beijing Peoples Republic of China
Presented at ICALEO 2008

Ni-base composite coatings reinforced by in situ synthesized multiple carbide particles were fabricated on medium carbon steel through powder-feeding laser cladding. The results indicate that laser cladding is an effective approach to fabricate required coatings, which combine heat and corrosion resistance of nickel based superalloy, good hardness of the reinforced hard phase, and low cost of commercial spraying alloy powders. This offers a potential strengthening solution for wearing components which works in high temperature and caustic environment in industry. The composite coatings exhibit fine shape and are free of pores and cracks. The microstructure of the coatings is mainly composed of -Ni dendrite, interdendritic (-Ni/M23C6) eutectic and dispersed multiple carbide particles. With variation of the amount of strong-carbide-formation elements, there are significant changes in the morphology of microstructure and the size, distribution and density of precipitated particles. And the corresponding changes in the microhardness, friction and wear properties of the coatings were investigated by means of scanning electron microscopy, X-ray diffraction and tribology test.

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